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I am in the process of setting up an api which will have the subdomain "api.", I have been advised to change this to something "less obvious" to avoid automated attacks against it. I can't find any advice on naming subdomains to avoid attacks and from a business perspective the benefit of this approach is alerting non-tech professionals that we have an api.

Is this legitimate advice which I should seriously consider or is this something that will yield little to nothing in the way of security?

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This is something that will yield little to nothing in the way of security.

The subdomain will still be leaked:

  • In your client that uses the API. To connect to the API the client has to have the correct URL, and someone with the client can extract this URL.
  • In plaintext traffic when using SNI (Server Name Indication). The subdomain is sent plain text before setting up an encrypted connection, in most cases.
  • In certificate transparency logs. If you request a HTTPS certificate for your domain, the domainname will end up in a public log.
  • Thanks, I felt it wouldn't improve security much but it's always nice to double check. I appreciate your help – Mike Mar 21 at 9:29

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